GDF-11 (Growth Differentiation Factor 11) vs GHK-Cu
A neutral, side-by-side comparison of two anti-aging & longevity peptides — their mechanisms, dosing ranges, administration routes, side effects, and research evidence. For research and educational purposes only.
GDF-11 (Growth Differentiation Factor 11)
TGF-β superfamily member proposed as a 'young blood factor' — circulating GDF-11 declines with age, and young plasma transfusion in parabiosis experiments reversed aging phenotypes in mice. A high-profile but contested research area: some studies show rejuvenating effects in heart, muscle, and brain; others using purified recombinant GDF-11 show cardiac hypertrophy and muscle wasting at pharmacologic doses.
Full profileGHK-Cu
GHK-Cu is a naturally occurring copper peptide found in human plasma, saliva, and urine. It plays a role in wound healing, skin regeneration, and anti-inflammatory signaling. Levels decline significantly with age, which has driven interest in topical and injectable supplementation.
Full profile| GDF-11 (Growth Differentiation Factor 11) | GHK-Cu | |
|---|---|---|
| Category | Anti-Aging & Longevity | Anti-Aging & Longevity |
| Also known as | GDF11, Bone Morphogenetic Protein 11, BMP-11, young blood factor | Copper Peptide GHK-Cu, Glycyl-L-histidyl-L-lysine copper, Copper Tripeptide-1 |
| Evidence | Research-stage | Research-stage |
| Dosing range | 0.1mg/kg–1mg/kg mg/kg, every 3–7 days (SC); research protocols vary widely | 1mg–3mg mg, daily to every other day (injectable); twice daily (topical) |
| Administration | Subcutaneous injection, Intravenous (research) | Subcutaneous injection, Topical application (cream, serum — most common consumer use), Intradermal injection (skincare clinics) |
| Key side effects | Cardiac hypertrophy (at pharmacologic doses — the key safety concern), Muscle wasting and weight loss, Reproductive effects (GDF-11 inhibits spermatogenesis and folliculogenesis), Cachexia-like syndrome at high doses | Injection site redness (transient), Mild skin irritation with topical (typically resolves with reduced frequency), Rarely reported: metallic taste (with injectable use at higher doses) |
| Cited sources | 2 references | 4 references |
Key differences
- Administration: GDF-11 (Growth Differentiation Factor 11) — Subcutaneous injection, Intravenous (research); GHK-Cu — Subcutaneous injection, Topical application (cream, serum — most common consumer use), Intradermal injection (skincare clinics).
- Dosing units differ: GDF-11 (Growth Differentiation Factor 11) is dosed in mg/kg, GHK-Cu in mg — they operate at different scales.
- Frequency: GDF-11 (Growth Differentiation Factor 11) is typically every 3–7 days (SC); research protocols vary widely; GHK-Cu is daily to every other day (injectable); twice daily (topical).
- Research depth: this profile cites 2 sources for GDF-11 (Growth Differentiation Factor 11) vs 4 for GHK-Cu.
How each works
GDF-11 (Growth Differentiation Factor 11)
The 2013–2014 parabiosis studies from Amy Wagers' lab at Harvard proposed GDF-11 as the primary rejuvenating factor in young blood. However, subsequent work by Lee and others showed that purified recombinant GDF-11 at pharmacologic doses caused cardiac hypertrophy, muscle atrophy, and weight loss — opposite of the proposed rejuvenating effects. The field now views GDF-11 as highly dose-sensitive with a narrow therapeutic window, if one exists at all.
GHK-Cu
GHK-Cu has been studied for its ability to stimulate collagen, elastin, and glycosaminoglycan synthesis, promote wound healing, and exhibit antioxidant and anti-inflammatory effects. Gene-expression work by Pickart and colleagues found GHK altered expression (>50% up or down) in roughly 32% of assayed human genes — the basis of the widely-cited '~4,000 genes' figure. Its evidence is strongest for in-vitro and topical/cosmetic use; robust human trials of injectable/systemic GHK-Cu are lacking.
This comparison aggregates public research and structured profile data for informational purposes only. It is not medical advice and does not recommend either compound for human use. Consult a qualified healthcare provider before considering any peptide.